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<h1><a name="SQL-DROPDATABASE"></a>DROP DATABASE</h1>
<div class="REFNAMEDIV"><a name="AEN50548"></a><h2>名称</h2>DROP DATABASE&nbsp;--&nbsp;删除一个数据库</div>
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<div class="REFSYNOPSISDIV"><a name="AEN50553"></a><h2>语法</h2>
<pre class="SYNOPSIS">DROP DATABASE [ IF EXISTS ] <tt class="REPLACEABLE"><i>name</i></tt></pre>
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<div class="REFSECT1"><a name="AEN50556"></a><h2>描述</h2>
<p><tt class="COMMAND">DROP DATABASE</tt> 删除一个数据库。删除一个现存数据库的目录入口并且删除包含数据的目录。只有数据库所有者能够执行这条命令。还有，如果你或者任何其他人正在与目标数据库连接，那么就不能执行这条命令。所以要与 <tt class="LITERAL">postgres</tt> 或者任何其它数据库连接，再发出这条命令。</p>
<p><tt class="COMMAND">DROP DATABASE</tt> 不能撤销，小心使用！</p>
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<div class="REFSECT1"><a name="AEN50563"></a><h2>参数</h2>
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<dt><tt class="LITERAL">IF EXISTS</tt></dt>
<dd><p>如果指定的数据库不存在，那么发出一个 notice 而不是抛出一个错误。</p></dd>
<dt><tt class="REPLACEABLE"><i>name</i></tt></dt>
<dd><p>要被删除的现有数据库名</p></dd>
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<div class="REFSECT1"><a name="AEN50576"></a><h2>注意</h2>
<p><tt class="COMMAND">DROP DATABASE</tt> 不能在事务块中执行。</p>
<p>这条命令在和目标数据库连接时不能执行。通常更好的做法是用 <a href="app-dropdb.html"><i><i>dropdb</i></i></a> 程序代替，该程序是此命令的一个封装。</p>
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<div class="REFSECT1"><a name="AEN50582"></a><h2>兼容性</h2>
<p>SQL 标准里没有 <tt class="COMMAND">DROP DATABASE</tt> 语句。</p>
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<div class="REFSECT1"><a name="AEN50586"></a><h2>又见</h2><a href="sql-createdatabase.html"><i>CREATE DATABASE</i></a></div>
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